Power-press.



' E. W. ZEH.

POWER PRESS.

APPLICATION FILED DEC. 27' 1915.

1,199,854. Patented 00t.3,1916.

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E. W, ZEH.

POWER PRESS.

APPLICATION FILED DEC-27, I9 t5.

1 1 99,854. Patented Oct. 3, 1916.

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EDMT J'ND W. ZEH, OF NEWARK, NEW JERSEY.

POWER-PRESS.

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed December 27, 1915. Serial No. 68,635.

To all whom it may concern Be it known that I, EDMUND W. ZEH, a citizen of the United States. and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Power-Presses, of which the following is a description,

This invention relates to that class of power presses in which a head for carrying the upper die is moved up and down by a screw, said screw being rotated by a friction wheel at its upper end, and adapted to be driven in one direction or the other by opposite drive disks, such a press being described in detail in my prior Patent No. 1,151,845 of Aug. 31, 1915 to which reference may be had for a better understanding of the construction and operation of press to which the present invention is applied.

The objects of the invention are to provide in a power press means for preventing breakage when the friction wheel and screw descend too far; to provide means for this purpose in the path ofzmovement of the friction wheel, between it .and the frame; for this purpose to provide an elastically supported brake; to employ a spring for obtaining the elasticity; to place the spring under initial tension to release the compression on the spring created by the friction wheel so asto permit elevating the friction wheel after it is stopped; to secure simplicity of construction and operation,

and to obtain other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views Figure 1 is aperspective view of a press embodying my invention; Fig. 2 is a front elevation of a portion of a press having parts broken away; Fig. 3 is a vertical section on line A-A of Fig. 2, and Fig. 4. is a transverse section on line B-B of Fig. 2.-

In the specific embodiment of the invention illustrated in said drawings, the reference numeral 1 indicates the frame of a press, shown mounted upon legs 2, 2 to elevate it to a suitable and convenientheight. Said frame 1 is centrally open, providing a vertical slideway for a head or hammer 3 carried upon the lower end of a screw 4: which works through the top of said frame and has fixed upon its upper end above the frame a horizontal wheel 5 providing at its periphery a friction surface all as is common and well known in the art. Since the screw, which is fast with respect to the friction wheel, passes through the upper part of the frame of the press, it will be obvious that by rotating the screw sufficiently in the right direction the friction wheel will engage the frame. Such engagement when at considerable speed, will cause breakage, fracturing the friction wheel of frame, snapping the screw off or otherwise damaging the press, which is of course to be avoided if possible, and it is the feature of the present invention to prevent this engagement and thus avoid any injury to the machine. It may be added that in presses, such as shown, having a treadle 6, depression of which shifts one of a pair of drive disks 7 into engagement with the friction wheel rotating the same accidental striking of the friction wheel is most likely to occur. lVith no work in the press, the hammer 3 descends by its momentum past the position where it should be stopped before the one who stepped on the treadle has time to shift the disks out of contact with the friction wheel, and to prevent breakage when this occurs, I- provide a pair of emergency brakes at the top of the frame beneath the friction wheel for stopping the same.

The brakes each comprise preferably a cylindrical brakehead 8 axially vertical, faced upon its top with leather or other material 9 and havin'g an enlarged outer or upper end 10 and reduced neck 11 depending therefrom. Around the neck and engaging the under side of the'enlarged outer end 10 is a spiral spring 12 extending axially of the brake head and held under an initial pressure, so as to resist further compression with greater force. For so holding the spring under pressure a follower 13 is provided comprising a cylindrical body por-- the bolt is screwed axially into the brake head, holding the brake head and follower together and compressing the spring. It willbe obvious that the farther the screw is turned into the brake head the greater the initial pressure of the spring. The brake as thus described is positioned within a suitable holding pocket 18, opening upward at the top of the frame beneath the friction wheel, and the brake shoe projects sufliciently above the top of the frame to be engaged by the friction wheel before the latter can engage the frame. As shown in the drawings, a collar 19 integral with the frame incloses the upper portion of the brake and forms within itself a portion of the pocket therefor.

In operation, as the friction wheel turns and lowers, it frictionally engages upon the brake heads 8 and by continued turning compresses the spring 12 until the inertiaof the moving parts is used up and the wheel comes to rest. The necessary pressure in I the springs to bring the friction wheel to rest in a short period is such that it is dificult to turn the wheel back for releasing the same from the brakes. In order, therefore to free thefriction wheel, I provide means for relieving pressure in the springs without first turning the wheel. For this purpose,

the follower 13 is shown seated upon a transverse support 20 adapted to be moved and in one position retain the follower raised and in another position permit the follower to lower. This support is shown as a substantial pin rotatable in the frame and extending diametrically of the pocket with an end protruding outside of the frame and squared or made angular in cross-section to receive a wrench for turning the pin. The portion of the pin within the pocket is longitudinally cut away onone side of itself, thus providing an. eccentric mounting upon which the follower will seat. Obviously with the cut away portion of the pin turned up the follower will be at a lower elevation than with the solid portion turned up. In use, the pin is turned with the solid portion up so the follower and brake head are in their uppermost position; then when the friction wheel compresses the spring the pin may be turned, thus releasing the pressure and permitting the wheel to be turned ,back and raised. After the wheel is raised,

meaeea the detent member will lodge and thereby hold the pin stationary.

Although I. prefer to employ a pair of brakes at diametrically, opposite points on the frame in position to engage the rim of the friction wheel, it is within the scope of the invention tohavemore or less as may be found necessary oradesirable and at any position preferred.

The operating mechanisms for shifting the driving disks into and out of engagement with the friction wheel, as shown herein and described in detail in myprior Patent No. 1,151,845 above referred to, includes a vertical control rod'25 turning of which shifts the disks. As the hammer approaches its lowest position the sloping portion of a lug 26 thereon engages the sloping portion of a dog 27 on the rod for twisting the same, and as illustrated in Fig. 1, the outer ,or free ends of the dog and lug are vertical and so related that the full swing of the rod to shift the diskswill be performed by the sloping portions after which the vertical portions permit the dog and lug to pass so as not to break any of the operating mechanisms. 7

Obviously detail modifications and changes may be made in the manufacture of my improved power press without departing from the spirit and scope of the invention-and I do not wish to be understood as restricting myself except as required by the following claims.

Having thus described the invention, what I claim is,

1. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, and a brake above the top of the frame in the path of downward movement of the friction wheel adapted to be engaged thereby and prevent engagement of the friction wheel with the frame.

2. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the end of said friction wheel, and an emergency brake in the path of downward movement of the friction wheel below the normal stroke of the same adapted to engage and prevent the friction wheel from striking the frame.

3. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, and a pair of emergency 'said frame, a friction wheel on said screw,

drive disks adapted to engage the edge of said friction wheel, and an elastically supported brake shoe in the path. of downward use movement of the friction wheel adapted to engage and prevent the friction wheel from striking the frame.

5. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, and means resiliently supporting said brake shoe whereby the same may be moved by the friction wheel while bringing said wheel to rest.

6. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw,

drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, and a spring resiliently supporting said brake shoe whereby the same may be moved by the friction wheel while bringing said wheel to rest.

7. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, a spring resiliently supporting said brake shoe whereby the same may be moved by the friction wheel while bringing said wheel to rest, and means for holding said spring under an initial pressure and thereby increaseits effective strength.

8. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, a follower, a springv between said brake shoe and follower, and means for holding said parts together.

9. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw,

drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, a follower, a spring between said brake shoe and follower, and means for drawing the brake shoe and follower toward.

each other and holding the spring under an initial pressure thereby.

10. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a brake shoe in the path of downward movement of the friction wheel, a follower, a spring between said brake shoe and follower, and a bolt connecting said shoe and follower slidable in one and threaded into the other whereby the spring ma y be compressed.

11. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge'of said friction wheel, a brake shoe in the path of downward movement of the friction I friction wheel, and means for releasing said brake to permit raising the friction wheel again. V V 13. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a. brake shoe in the path of downward movement 'of the friction wheel, resilient means supportlng sald brake shoe adapted to exert a pressure as the frietion wheel is lowered against the brake shoe, and means for releasing said pressure so as to free the brake from the friction wheel.

141. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a resilient brake in the path of downward movement of the friction wheel adapted to be compressed as the friction wheel engages the same and frictionally stop said wheel, and means for releasing the compression from acting-upon the friction wheel whereby said wheel may be raised.

15. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a resilient brake in the path of downward movement of the friction wheel adapted to be compressed as the friction wheel engages the same and frictionally stop said wheel, and supporting means for said brake adapted to permit the same to lower and thereby release the friction wheel.

16. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw,

drive disks adapted to engage the edge of.

said friction wheel, a resilient brake in the path of downward movement of the friction wheel adapted fro be compressed as the friction wheel engages'the same and. 'ictionally stop said wheel, and an eccentric support for said brake adapted to be turned and there: 1y permit the brake to lower and release the friction wheel.

17. In a press, a frame,, a screw mounted in'said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a resilient brake in the path of downward movement of the friction wheel adapted to be compressml as the friction wheel engages the same and frietionally 13 stop said wheel, and a rotatable pin supporting said brake having a cut away portion into which the brake may seat whereby in one position of the pin the brake is held in raised position and in another position of the pin the brake is allowed to lower.

18. In a press, a frame, a screw mounted in said frame, a friction wheel on said screw, drive disks adapted to engage the edge of said friction wheel, a resilient brake in the path of downward movement of the friction wheel adapted to be compressed as the friction wheel engages the sameand frictionally stop said wheel, a rotatable pin supporting said brake having a cut away portion into i which the brake may seat whereby in one position of the pin the brake is held in raised position and in another position of tion to which it is turned.

19. In a press, a frame, a screw mounted in said frame, a hammer on said screw, drive disks adapted one to elevate and the other to lower the friction wheel by rotating the same,a rotatable control rod, means connecting said. rod to said disks for shifting them into and out of engagement with the friction wheel, a lug on said hammer, a dog on said control rod adapted to be engaged by the lug for swinging the control rod and adapted to pass said lug after the controlrod has been swung, and a brake for stopping said friction wheel and hammer after the lug and dog have engaged.

EDMUND W. ZEH. 

